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Information Please: 1. I read that Parkinson's Disease is "the fourth most common neurological disease of the elderly". Can anyone tell me what the first three are? 2. "Hyperexcitable reflex blinks are a cardinal sign of Parkinson's disease." I never heard of that before! Reflex blinks have nothing to do with the low blink rate frequently mentioned in books about PD. Instead they are reaction to a threatened blow, first identified as "reflex" by the philosopher Descartes. How can "hyperexcitability" be observed, and why isn't it a standard part of the neurologist's diagnostic repertoire? To all who may be disappointed by My fallibility, My apologies. To anyone who can furnish answers to these questions, My thanks. Cheers, Joe J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks CA 91403